Παραπομπή APA

Nils, Bjorkman, & Nils Bjorkman. (1970). Atlas of placental bine sterubcture. Bailliere Tindall.

Παραπομπή Chicago Style

Nils, Bjorkman, και Nils Bjorkman. Atlas of Placental Bine Sterubcture. Bailliere Tindall, 1970.

Παραπομπή MLA

Nils, et al. Atlas of Placental Bine Sterubcture. Bailliere Tindall, 1970.